openoffice: fix psutil usage in _releaseOpenOfficePort

This uses psutil.process_iter to iterate on all processes, but in the meantime some process might terminate.

As we could observe in the logs:

2021-04-26 12:53:02 - Cloudooo - DEBUG - Stop Pid - 15816
Exception in thread Thread-1:
Traceback (most recent call last):
  File "python2.7/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "cloudooo-repository/cloudooo/handler/ooo/monitor/request.py", line 60, in run
    self.openoffice.restart()
  File "cloudooo-repository/cloudooo/handler/ooo/application/application.py", line 79, in restart
    self.stop()
  File "cloudooo-repository/cloudooo/handler/ooo/application/openoffice.py", line 169, in stop
    self._releaseOpenOfficePort()
  File "cloudooo-repository/cloudooo/handler/ooo/application/openoffice.py", line 122, in _releaseOpenOfficePort
    if process.exe() == join(self.office_binary_path, self._bin_soffice):
  File "psutil-5.8.0-py2.7-linux-x86_64.egg/psutil/__init__.py", line 660, in exe
    exe = self._proc.exe()
  File "psutil-5.8.0-py2.7-linux-x86_64.egg/psutil/_pslinux.py", line 1688, in exe
    raise NoSuchProcess(self.pid, self._name)
NoSuchProcess: psutil.NoSuchProcess process no longer exists (pid=19382)

Update to catch and ignore such exceptions, and minor refactorings such as:

• Not calculate the path of openoffice binary in the loop, this is not supposed to change.
• Remove reference to lsof in logged message, this does not use lsof.
• Catch all exceptions.